軫宿三

**軫宿三**
	軫宿三的位置 (紅圈處)
觀測資料; 曆元 J2000.0
星座	烏鴉座
星官	軫 (星官)
赤經	12h 29m 52s
赤緯	-16° 30′ 55.5″
視星等（V）	+2.96
特性
光譜分類	A0V
U−B 色指數	-0.05
B−V 色指數	-0.05
天體測定
徑向速度 (Rv)	+9 km/s
自行 (μ)	赤經：−210.49 mas/yr ; 赤緯：−138.74 mas/yr
視差 (π)	37.55 ± 0.16 mas
距離	86.9 ± 0.4 ly ; (26.6 ± 0.1 pc)
絕對星等 (MV)	+0.83
詳細資料
質量	2.5 M☉
亮度	60 L☉
溫度	10400 K
自轉速度 (v sin i)	236 km/s
年齡	260+14; −24×106 or 3.2+0.1; −0.1×106 年
其他命名
	7 Crv, BD−15 3482, FK5 465, HD 108767, HIP 60965, HR 4757, SAO 157323.
參考資料庫
SIMBAD	資料

軫（zan2）宿（sau3）三（δ Crv/烏鴉座δ），其英文傳統名稱為Algorab，^[2]是一顆位於南天星座烏鴉座的恆星三等星，距離太陽87光年^[3]。

恆星特性

軫宿三有2.5倍太陽質量，造成它的光度比太陽高的多，約是60倍太陽光度。表面溫度10,400K，散發出白色的光芒。^[4]它的恆星分類為A0V-IV^[5]，但是它的光度比主序星還要高一些。因此它可能是個年齡2.6億的次巨星，已經快要耗盡核心的氫並且正在演化離主序帶，或是320萬年的前主序星，還沒有完全凝聚並且在主序帶上穩定下來。^[6]

1823年，英國天文學家James South和約翰·赫歇爾發現軫宿三是一個雙星。從那時起，兩星的相對位置都沒有改變。^[7]9.3等的伴星，HR 4757 B，恆星分類K2Ve，角距離24.2弧秒，位置角214°。^[7]^[8]雖然兩星有相同的自行，年齡的明顯差距代表它們可能不是有物理關聯的。^[6]

2006年的研究發現軫宿三沒有代表星周物質存在紅外線超量，^[9]但是更熱的星際塵埃在2014年的一個研究被檢測到。^[10]

參考

^ Kaler, James B. ALGORAB (Delta Corvi). Stars. University of Illinois. [2010-02-24]. （原始內容存檔於2020-07-28）.
^ IAU Catalog of Star Names. [28 July 2016]. （原始內容存檔於2018-07-07）.
^ van Leeuwen, F., Validation of the new Hipparcos reduction, Astronomy and Astrophysics, November 2007, 474 (2): 653–664, Bibcode:2007A&A...474..653V, arXiv:0708.1752  , doi:10.1051/0004-6361:20078357
^ The Colour of Stars, Australia Telescope, Outreach and Education (Commonwealth Scientific and Industrial Research Organisation), December 21, 2004 [2012-01-16], （原始內容存檔於2012-03-10）
^ Gray, R. O.; et al, Contributions to the Nearby Stars (NStars) Project: Spectroscopy of Stars Earlier than M0 within 40 parsecs: The Northern Sample I, The Astronomical Journal, July 2006, 132 (1): 161–170, Bibcode:2006AJ....132..161G, arXiv:astro-ph/0603770  , doi:10.1086/504637
^ ^6.0 ^6.1 Montesinos, B.; et al, Parameters of Herbig Ae/Be and Vega-type stars, Astronomy and Astrophysics, March 2009, 495 (3): 901–917, Bibcode:2009A&A...495..901M, arXiv:0811.3557  , doi:10.1051/0004-6361:200810623
^ ^7.0 ^7.1 Garfinkle, Robert A., Star-Hopping: Your Visa to Viewing the Universe, Cambridge University Press: 109, 1997, ISBN 0-521-59889-3
^ Eggleton, P. P.; Tokovinin, A. A., A catalogue of multiplicity among bright stellar systems, Monthly Notices of the Royal Astronomical Society, September 2008, 389 (2): 869–879, Bibcode:2008MNRAS.389..869E, arXiv:0806.2878  , doi:10.1111/j.1365-2966.2008.13596.x
^ Su, K. Y. L.; et al, Debris Disk Evolution around A Stars, The Astrophysical Journal, December 2006, 653 (1): 675–689, Bibcode:2006ApJ...653..675S, arXiv:astro-ph/0608563  , doi:10.1086/508649
^ Ertel, S.; Absil, O.; Defrère, D.; Le Bouquin, J.-B.; Augereau, J.-C.; Marion, L.; Blind, N.; Bonsor, A.; Bryden, G.; Lebreton, J.; Milli, J. A near-infrared interferometric survey of debris-disk stars. IV. An unbiased sample of 92 southern stars observed in H band with VLTI/PIONIER. Astronomy & Astrophysics. 2014, 570: 20. Bibcode:2014A&A...570A.128E. arXiv:1409.6143  . doi:10.1051/0004-6361/201424438. A128.

[kaler-1] Kaler, James B. ALGORAB (Delta Corvi). Stars. University of Illinois. [2010-02-24]. （原始內容存檔於2020-07-28）.

[IAU-CSN-2] IAU Catalog of Star Names. [28 July 2016]. （原始內容存檔於2018-07-07）.

[aaa474_2_653-3] van Leeuwen, F., Validation of the new Hipparcos reduction, Astronomy and Astrophysics, November 2007, 474 (2): 653–664, Bibcode:2007A&A...474..653V, arXiv:0708.1752  , doi:10.1051/0004-6361:20078357

[csiro-4] The Colour of Stars, Australia Telescope, Outreach and Education (Commonwealth Scientific and Industrial Research Organisation), December 21, 2004 [2012-01-16], （原始內容存檔於2012-03-10）

[aj132_1_161-5] Gray, R. O.; et al, Contributions to the Nearby Stars (NStars) Project: Spectroscopy of Stars Earlier than M0 within 40 parsecs: The Northern Sample I, The Astronomical Journal, July 2006, 132 (1): 161–170, Bibcode:2006AJ....132..161G, arXiv:astro-ph/0603770  , doi:10.1086/504637

[aaa495_3_901-6] 6.0 ^6.1 Montesinos, B.; et al, Parameters of Herbig Ae/Be and Vega-type stars, Astronomy and Astrophysics, March 2009, 495 (3): 901–917, Bibcode:2009A&A...495..901M, arXiv:0811.3557  , doi:10.1051/0004-6361:200810623

[garfinkle1997-7] 7.0 ^7.1 Garfinkle, Robert A., Star-Hopping: Your Visa to Viewing the Universe, Cambridge University Press: 109, 1997, ISBN 0-521-59889-3

[mnras389_2_869-8] Eggleton, P. P.; Tokovinin, A. A., A catalogue of multiplicity among bright stellar systems, Monthly Notices of the Royal Astronomical Society, September 2008, 389 (2): 869–879, Bibcode:2008MNRAS.389..869E, arXiv:0806.2878  , doi:10.1111/j.1365-2966.2008.13596.x

[apj653_1_675-9] Su, K. Y. L.; et al, Debris Disk Evolution around A Stars, The Astrophysical Journal, December 2006, 653 (1): 675–689, Bibcode:2006ApJ...653..675S, arXiv:astro-ph/0608563  , doi:10.1086/508649

[Ertel-10] Ertel, S.; Absil, O.; Defrère, D.; Le Bouquin, J.-B.; Augereau, J.-C.; Marion, L.; Blind, N.; Bonsor, A.; Bryden, G.; Lebreton, J.; Milli, J. A near-infrared interferometric survey of debris-disk stars. IV. An unbiased sample of 92 southern stars observed in H band with VLTI/PIONIER. Astronomy & Astrophysics. 2014, 570: 20. Bibcode:2014A&A...570A.128E. arXiv:1409.6143  . doi:10.1051/0004-6361/201424438. A128.

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